// #include<iostream>
// #include<pthread.h>
// #include<string>
// #include<cstdio>
// #include<unistd.h>
// //创建全局锁和全局变量
// pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
// pthread_cond_t cond = PTHREAD_COND_INITIALIZER;

// //执行函数
// void*active(void*args)
// {
//     std::string name = static_cast<const char*>(args);
//     while(true)
//     {
//         //形成临界区
//         pthread_mutex_lock(&mutex);
//         //在指定条件变量下形成等待队列
//         pthread_cond_wait(&cond,&mutex);
//         printf("%s is active\n",name.c_str());
//         pthread_mutex_unlock(&mutex);
//     }
// }

// int main(void) 
// {
//     pthread_t t1, t2, t3, t4;
//     pthread_create(&t1, nullptr, active, (void*)"thread 1");
//     pthread_create(&t2, nullptr, active, (void*)"thread 2");
//     pthread_create(&t3, nullptr, active, (void*)"thread 3");
//     pthread_create(&t4, nullptr, active, (void*)"thread 4");

//     sleep(1);
//     printf("Main thread ctl begin...\n");
//     while(true)
//     {
//         printf("main wake up thread...\n");
//         //唤醒条件变量下的线程
//         //pthread_cond_signal(&cond);//唤醒一个
//         pthread_cond_broadcast(&cond);//all
//         sleep(1);
//     }

//     pthread_join(t1, NULL);
//     pthread_join(t2, NULL);
//     pthread_join(t3, NULL);
//     pthread_join(t4, NULL);
//     return 0;
// }



////////////分批放票代码////////////////
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <sched.h>

int ticket = 0;
pthread_mutex_t mutex;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;

void *route(void *arg)
{
    char *id = (char *)arg;
    while (1)
    {
        pthread_mutex_lock(&mutex);
        if (ticket > 0)
        {
            usleep(1000);
            printf("%s sells ticket:%d\n", id, ticket);
            ticket--;
            pthread_mutex_unlock(&mutex);
        }
        else
        {
            printf("%s wait on cond!\n", id);
            pthread_cond_wait(&cond, &mutex); //醒来的时候，会重新申请锁！！
            printf("%s 被叫醒了\n", id);
        }
        pthread_mutex_unlock(&mutex);
    }
    return nullptr;
}

int main(void)
{
    pthread_t t1, t2, t3, t4;

    pthread_mutex_init(&mutex, NULL);

    pthread_create(&t1, NULL, route, (void *)"thread 1");
    pthread_create(&t2, NULL, route, (void *)"thread 2");
    pthread_create(&t3, NULL, route, (void *)"thread 3");
    pthread_create(&t4, NULL, route, (void *)"thread 4");

    int cnt = 10;

    while(true)
    {
        sleep(5);
        ticket += cnt;
        printf("主线程放票喽, ticket: %d\n", ticket);
        pthread_cond_signal(&cond);
    }


    pthread_join(t1, NULL);
    pthread_join(t2, NULL);
    pthread_join(t3, NULL);
    pthread_join(t4, NULL);
    pthread_mutex_destroy(&mutex);
}